The filter design doesn't seem to be a huge engineering work, though I do see from your article that the intake housing and cover does have sound level/noise in mind at times.
I am gonna see if the air filter housing can be swapped out.
Batteries will discharge slowly, though the Lithium batteries have much lower self discharging rate. It's just the way how the batteries work. Energizer or Duracells do discharge to non useable after 3-5years.
1. Doing DBCAM so often is not good for the battery. It was designed for when you install a new battery. Not to recalibrate degraded battery. That's why it askes you to enter the age of the battery, etc.
2. You need to understand that this battery is really a crappy one and the BMU is not...
You may have bad cell battery and it sounds you do. I am considering swapping the drive battery with the newer one from wrecker. 13.4kW battery from 2022. Someone in UK has swapped the 12kW battery with 13.4kW few yrs ago and he seems to be happy with it after much trials... He did say the...
Bought a set of wheels from a wrecker in Detroit for $400USD. I had to go pick them up (4-wheels). It wss from a 2017 Outlander. Not PHEV but they are direct fit.
It's not EU but i hope this helps.
It was straight forward on mine. About 30 min. I did it last summer so I may not recall much, but it may mave been a biy tricky on driver's side but it wasn't that hard. Just needed 2 wrench to tighten it.
Curt Manufacturing has a trailer hitch, custom fitted for 2018 Outlander PHEV.
https://www.curtmfg.com/part/13398
I just ordered mine from carid.com
https://www.carid.com/2018-mitsubishi-outlander-trailer-hitches/curt-class-3-rear-trailer-hitches-893893067.html
Should take 30min - 1 hr. Good...